'''
----+------------+--------+-----
 id | name       | sex    | age
----+------------+--------+-----
  1 | egon       | male   |  18
  2 | alex       | male   |  78
  3 | wupeiqi    | male   |  81
  4 | yuanhao    | male   |  73
  5 | liwenzhou  | male   |  28
  6 | jingliyang | female |  18
  7 | jinxin     | male   |  18
  8 | 成龙       | male   |  48
  9 | 歪歪       | female |  48
 10 | 丫丫       | female |  38
 11 | 丁丁       | female |  18
 12 | 星星       | female |  18
 13 | 格格       | female |  28
 14 | 张野       | male   |  28
 15 | 程咬金     | male   |  18
 16 | 程咬银     | female |  18
 17 | 程咬铜     | male   |  18
 18 | 程咬铁     | female |  18
----+------------+--------+-----
'''

# 几百万条数据的时候
# 树tree - 数据结构
# 平衡树 - balance tree - btree

























